Samsung MH020FVEA Service Manual page 147

4. Checking Display PCB LED if Error code is displayed.
See error code table if displayed.
5. Checking DC voltage on each point
Item
DC LINK
inverter 15V
Main control 12V
Main control 5V
6. Checking PFC
6. When Input current is over 2.8A PFC circuit will work to control the harmonics of AC current.
Checking is measuring DC-LINK voltage.
PFC ON (Compressor is working) : DC LINK voltage is over 300Vdc (AC line >220V )
After starting compressor DC Link voltage is going down because of compressor load.
But in case of 2.8A above , DC link voltage will go up over 300V. This voltage is in proportion to AC input voltage.
Current can be monitored with "VIEW MODE".
Press K4 key on the outdoor display PCB for several times to change the display to sensor temperature value.
Left 1 digit of the LED is data index and Right 3 digits are the value
Index
C
Samsung Electronics
Measuring point
Q803 E(-)~D101 Cathode (+)
C803 voltage
CN59 pin 1~pin 3
CN59 pin 1~pin 2
Value
Estimated Primary current value from
Compressor current
Normal value
about 1.4 times as much as Power AC Voltage
ex) AC220V ¡ 305~310Vdc
14.5V~15.5V
12V~15V
4.75V~5.25V
Remark
The unit is 0.1A
Troubleshooting
9-15